Mouth mask



FIG. 1 is a front, top, and right side perspective view of a mouth mask showing our new design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a left side view thereof, the right side view being a mirror image of FIG. 4;

FIG. 5 is a top view thereof; and,

FIG. 6 is a bottom view thereof.

The dashed broken lines show portions of the mouth mask that form no part of the claimed design. The dot-dashed broken lines illustrate the bounds of the claim and form no part thereof. 

CLAIM The ornamental design for a mouth mask, as shown and described. 